ASCO A31S30-4 - Air-Water Pressure Regulator, 1/4 in.SKU: A31S30-4ASCO A31S30-4 - 1/4 in. Air-Water Pressure Regulator, 2-30 PSI @ 15.DocumentationASCO Catalog 34 — Solenoid Valves & Coils Submittal (PDF)DocumentationASCO Catalog 34 — Solenoid Valves & Coils Submittal (PDF)